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<br />" <br /> <br />375,000 acre-feet to be supplied from the main stream, that being <br />the amount which it is proposed to deliver to Mexico through the All- <br />American Canal. Such an amount may be considered as the minimum <br />that will have to be supplied from upstream, since in the event no <br />Gila floodwater is available, the total quantity required will be in- <br />creased by 100,000 acre-feet. <br />"Senator McFARLAND. Did you say 'minimum'? <br />"Mr. LOWRY. That minimum to be supplied from upstream would <br />be the difference between the 1,130,000 acre-feet and the 1,500,000 <br />acre-feet. <br />"Estimates of return flow to the lower Colorado River below Boulder <br />Dam have been made before. <br />"Jacobs and StevEms, consulting engineers, in 1937 estimated the <br />return flow under two major assumptions. . . . <br />"Under assumption A, which involves full development of all <br />feasible projects on purely physical considerations, except that Cali- <br />fornia usage is based on her adopted priorities, the return flow was <br />estimated to be 1,198,000 acre-feet. Net desilting water was expected <br />to be 387,000 acre-feet in addition to the above. <br />"Under assumption B, based on consideration of allocations made <br />, to the upper and lower basins in the Colorado River compact, the <br />return flow was estimated as 900,000 acre-feet, with an additional <br />quantity of 347,000 acre-feet from desilting water. <br />"I want to say that those estimates are in fair accord with the <br />figures I submitted yesterday. <br />"This most recent estimate was participated in by a conference <br />of well-known engineers from the Bureau of Reclamation in the office <br />of the International Boundary Commission at EI Paso, Tex., last month. <br />At that time it was indicat8d that a total return flow of 930,000 acre- <br />feet would be available in the lower river. Other waste water reach- <br />ing-th e-ri ver-would-invol ve-the-minimum-of-J.-O O,89D-acre-feet-for-- ~ <br />desilting purposes plus another 100,000 acre-feet of unused Gila water, <br />making a total of 1,130,000 acre-feet of return and waste water. <br />"It is my understanding that the details as to how this figure was <br />derived will be taken care of later on, because I understand that the <br />engineers who participated in that meeting will testify." <br /> <br />Mr. Lowry presented figures on the acreage of land irrigated in the United States <br /> <br />and Mexico and the use of water in the two countries on pages 240-242 as follows: <br /> <br />"Figures available from the study of the Colorado River by engineers <br />of the Bureau of Reclamation, and reported as for the year 1940, show a <br />total area within the United States presently irrigated as follows: In the <br />upper basin, 1,311,950 acres; in the lower basin, 1,323,300 acres; that <br />makes a total of 2, 635,000 acres. . . <br /> <br />-15- <br />